I have a fresh Minecraft install and the most up-to-date Java download but I keep getting this message when I run Minecraft: There was a fatal error starting up minecraft and FML. Minecraft cannot launch in it's current configuration.

 

here's my ForgeModLoader-client-0.log

 

2013-04-09 17:08:59 [iNFO] [ForgeModLoader] Forge Mod Loader version 5.1.8.611 for Minecraft 1.5.1 loading

2013-04-09 17:08:59 [iNFO] [ForgeModLoader] Java is Java HotSpot Client VM, version 1.7.0_17, running on Windows 7:x86:6.1, installed at C:\Program Files\Java\jre7

2013-04-09 17:08:59 [FINE] [ForgeModLoader] Java classpath at launch is /C:/Users/Randall/Desktop/MagicLauncher.exe

2013-04-09 17:08:59 [FINE] [ForgeModLoader] Java library path at launch is bin/natives

2013-04-09 17:08:59 [FINE] [ForgeModLoader] Enabling runtime deobfuscation

2013-04-09 17:08:59 [FINEST] [ForgeModLoader] All core mods are successfully located

2013-04-09 17:08:59 [FINEST] [ForgeModLoader] Discovering coremods

2013-04-09 17:08:59 [FINEST] [ForgeModLoader] Found a candidate coremod CodeChickenCore-Public-src.jar

2013-04-09 17:08:59 [WARNING] [ForgeModLoader] Found an un-manifested jar file in the coremods folder : CodeChickenCore-Public-src.jar, it will be ignored.

2013-04-09 17:08:59 [FINEST] [ForgeModLoader] Found a candidate coremod NotEnoughItems 1.4.5.1.jar

2013-04-09 17:08:59 [FINEST] [ForgeModLoader] Loading coremod NotEnoughItems 1.4.5.1.jar

2013-04-09 17:08:59 [WARNING] [ForgeModLoader] The coremod codechicken.nei.asm.NEICorePlugin does not have a MCVersion annotation, it may cause issues with this version of Minecraft

2013-04-09 17:08:59 [FINEST] [ForgeModLoader] Loaded coremod NotEnoughItems 1.4.5.1.jar

2013-04-09 17:08:59 [FINEST] [ForgeModLoader] Found library file argo-small-3.2.jar present and correct in lib dir

2013-04-09 17:08:59 [FINEST] [ForgeModLoader] Found library file guava-14.0-rc3.jar present and correct in lib dir

2013-04-09 17:08:59 [FINEST] [ForgeModLoader] Found library file asm-all-4.1.jar present and correct in lib dir

2013-04-09 17:08:59 [FINEST] [ForgeModLoader] Found library file bcprov-jdk15on-148.jar present and correct in lib dir

2013-04-09 17:08:59 [FINEST] [ForgeModLoader] Found library file deobfuscation_data_1.5.1.zip present and correct in lib dir

2013-04-09 17:09:00 [FINEST] [ForgeModLoader] Found library file scala-library.jar present and correct in lib dir

2013-04-09 17:09:00 [sEVERE] [ForgeModLoader] A critical problem occured registering the ASM transformer class cpw.mods.fml.common.asm.transformers.DeobfuscationTransformer

java.lang.ClassNotFoundException: cpw.mods.fml.common.asm.transformers.DeobfuscationTransformer

at cpw.mods.fml.relauncher.RelaunchClassLoader.findClass(RelaunchClassLoader.java:211)

at java.lang.ClassLoader.loadClass(Unknown Source)

at java.lang.ClassLoader.loadClass(Unknown Source)

at cpw.mods.fml.relauncher.RelaunchClassLoader.registerTransformer(RelaunchClassLoader.java:96)

at cpw.mods.fml.relauncher.RelaunchLibraryManager.handleLaunch(RelaunchLibraryManager.java:278)

at cpw.mods.fml.relauncher.FMLRelauncher.setupHome(FMLRelauncher.java:172)

at cpw.mods.fml.relauncher.FMLRelauncher.relaunchClient(FMLRelauncher.java:104)

at cpw.mods.fml.relauncher.FMLRelauncher.handleClientRelaunch(FMLRelauncher.java:38)

at net.minecraft.client.Minecraft.main(Minecraft.java:2228)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)

at java.lang.reflect.Method.invoke(Unknown Source)

at magic.launcher.Launcher.main(Unknown Source)

Caused by: java.lang.NoClassDefFoundError: net/minecraftforge/event/Event

at net.minecraftforge.transformers.EventTransformer.buildEvents(EventTransformer.java:59)

at net.minecraftforge.transformers.EventTransformer.transform(EventTransformer.java:35)

at cpw.mods.fml.relauncher.RelaunchClassLoader.runTransformers(RelaunchClassLoader.java:292)

at cpw.mods.fml.relauncher.RelaunchClassLoader.findClass(RelaunchClassLoader.java:199)

... 13 more

Caused by: java.lang.ClassNotFoundException: net.minecraftforge.event.Event

at cpw.mods.fml.relauncher.RelaunchClassLoader.findClass(RelaunchClassLoader.java:211)

at java.lang.ClassLoader.loadClass(Unknown Source)

at java.lang.ClassLoader.loadClass(Unknown Source)

... 17 more

Caused by: java.lang.AbstractMethodError

at cpw.mods.fml.relauncher.RelaunchClassLoader.runTransformers(RelaunchClassLoader.java:292)

at cpw.mods.fml.relauncher.RelaunchClassLoader.findClass(RelaunchClassLoader.java:199)

... 19 more

2013-04-09 17:09:00 [FINEST] [ForgeModLoader] Running coremod plugins

2013-04-09 17:09:00 [FINEST] [ForgeModLoader] Running coremod plugin FMLCorePlugin

 

 

Any help is appreciated

You have an old version of NEI in your coremods folder (along with the CodeChickenCore src jar, which isn't a mod and shouldn't be there).

 

Delete both of these things and it should work fine.

Wow, I can't believe it was such a simple mistake... This is the first time I've had a problem with forge so I thought it was something completely more difficult to fix.